diff --git a/src/main/java/org/codelibs/fess/app/web/admin/general/AdminGeneralAction.java b/src/main/java/org/codelibs/fess/app/web/admin/general/AdminGeneralAction.java
index ea7db6da8..79a45eca7 100644
--- a/src/main/java/org/codelibs/fess/app/web/admin/general/AdminGeneralAction.java
+++ b/src/main/java/org/codelibs/fess/app/web/admin/general/AdminGeneralAction.java
@@ -190,12 +190,12 @@ public class AdminGeneralAction extends FessAdminAction {
     private List<String> getDayItems() {
         final List<String> items = new ArrayList<String>();
         for (int i = 0; i < 32; i++) {
-            items.add(Integer.valueOf(i).toString());
+            items.add(Integer.toString(i));
         }
         for (int i = 40; i < 370; i += 10) {
-            items.add(Integer.valueOf(i).toString());
+            items.add(Integer.toString(i));
         }
-        items.add(Integer.valueOf(365).toString());
+        items.add(Integer.toString(365));
         return items;
     }